documentclass{article}

usepackage{tabularx}
usepackage{tabularht}
usepackage{multirow}

begin{document}

begin{table*}
begin{tabularhtx}{textheight}{textwidth}{XX}
multicolumn{2}{c}{begin{tabularx}{textwidth}{X}
Foo\
Foo\
Foo\
Foo\
end{tabularx}}\
interrowfill
multirow{2}{*}{begin{tabularx}{linewidth}[t]{X}
Bar\
Bar\
Bar\
Bar\
end{tabularx}} & {begin{tabularx}{linewidth}[t]{X}
Baz\
Baz\
Baz\
Baz\
end{tabularx}}\
 & {begin{tabularx}{linewidth}[t]{X}
Quz\
Quz\
Quz\
Quz\
end{tabularx}}\
end{tabularhtx}
end{table*}

end{document}